IIT JEE Advanced & Mains Physics 2018 : Electricity : Rank file / expected questions / Physicsmynd Elite Series / Page VI
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46 – 47 ] A cylindrical coaxial capacitor having an inner and outer conductors of radius a and b respectively , is charged to a voltage V . It’s dielectric constant K(r) of it’s dielectric varies with it’s cylindrical radius r . Then –
Find the radial dependence of it’s dielectric constant.
47 ] In the above question ,the electric field E(r) is given by –
A ] 
B ] 
C ] 
D ] 
48 ] A system consists of three point charges – 3nC , 2nC and 5nC , at locations (0, 0, 0), (0, 0, 1), and (1, 0, 0), respectively.Then the energy of this system is –
A ] W 
nJ
B ] W 
nJ
C ] W 
nJ
D ] W 
nJ
49 – 50 ] A charge Q is equally divided between three identical tiny spheres of mass m which are suspended by threads of negligible masses and equal length l from a common point. If they come to equilibrium at the corners of a horizontal equilateral triangle whose sides are d ,then 
is proportional to –
A ] 
B ] 
C ] 
D ] 
50 ] In the above arrangement , find Q ?
51 – 54 ] The figure below shows a charged ring of radius R , into the center of which , an electron e is brought in through a distance x . Questions 51 – 54 are based on this –
51] The acceleration experienced by the electron is proportional to –
A ] 
B ] 
C ] 
D ] 
52 ] At what distance from the center of the ring is the electric field maximum ?
53 ] Does the electron experience SHM [ simple harmonic motion ] ?
54 ] If it experiences SHM ,then find the tension , T , acting on the electron ?
